The present invention relates to the field of rotary imaging, in particular to a rotary imaging system, a rotary imaging method and a rotary device. A rotary imaging system of a rotary device comprises a rotating body with a lamp belt module group; a circuit board installed on the rotating body, the circuit board rotating synchronously with the rotating body; an acceleration detection component installed at a predetermined position on the circuit board for acquiring acceleration detection data at the predetermined position when the circuit board rotates; and a control module used for obtaining an acceleration value of the predetermined position based on the acceleration detection data, further obtaining a rotation speed value of the circuit board based on the acceleration value and a position parameter corresponding to the predetermined position, and driving the lamp belt module group to realize rotary imaging based on the rotation speed value.
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9. A rotary imaging method of a rotary device, comprising:
acquiring, from an acceleration detection component comprising a first accelerometer and a second accelerometer, acceleration detection data at a predetermined position on a circuit board; the circuit board rotating synchronously with a rotating body of the rotary device;
obtaining an acceleration value of the predetermined position based on the acceleration detection data;
obtaining a period number based on the acceleration value and a position parameter corresponding to the predetermined position; and
obtaining a rotation speed value of the circuit board based on the period number, and driving a lamp belt module group to realize rotary imaging based on the rotation speed value.
1. A rotary imaging system of a rotary device, comprising:
a rotating body with a lamp belt module group;
a circuit board installed on the rotating body, the circuit board rotating synchronously with the rotating body;
an acceleration detection component installed at a predetermined position on the circuit board for acquiring acceleration detection data at the predetermined position when the circuit board rotates; and
a control module installed on the circuit board and respectively connected with the lamp belt module group and the acceleration detection component, used for obtaining an acceleration value of the predetermined position based on the acceleration detection data, further obtaining a rotation speed value of the circuit board based on the acceleration value and a position parameter corresponding to the predetermined position, and driving the lamp belt module group to realize rotary imaging based on the rotation speed value; and
wherein the acceleration detection component comprises a first accelerometer and a second accelerometer.
2. The rotary imaging system of a rotary device according to
obtaining the acceleration value based on the acceleration detection data;
obtaining a period number of the circuit board based on the acceleration value and the position parameter; and
obtaining the rotation speed value based on the period number.
3. The rotary imaging system of a rotary device according to
the acceleration detection data comprise first detection data obtained by the first accelerometer and second detection data obtained by the second accelerometer; the position parameter comprises a first rotation radius of the first accelerometer or the second accelerometer.
4. The rotary imaging system of a rotary device according to
obtaining the period number based on a first period number calculation formula; wherein the first period number calculation formula is:
T=√{square root over (8π2R1/(a1+a2))}; where T is the period number; R1 is the first rotation radius; a1 is the first detection data; a2 is the second detection data.
5. The rotary imaging system of a rotary device according to
acquiring a static detection value and a position deviation value of the first accelerometer and the second accelerometer;
performing compensation calculation based on the first detection data, the second detection data, the rotation radius, the static detection value and the position deviation value to obtain the period number; wherein a formula of the compensation calculation is:
T=√{square root over (4π2(2R1+ΔR)/(a1+a2−a0))}; where T is the period number; R1 is the rotation radius; ΔR the position deviation value of the first accelerometer and the second accelerometer; a1 is the first detection data; a2 is the second detection data; a0 is the static detection value of the first accelerometer and the second accelerometer.
6. The rotary imaging system of a rotary device according to
the control module is further used for judging whether a rotating surface of the circuit board is horizontal based on the first direction detection data and the second direction detection data, and if so, using a second period number calculation formula to obtain the period number based on the first direction detection data, the second direction detection data and the second rotation radius; the second period number calculation formula is:
T=2π/√{square root over ((a3 COS θ+a4 SIN θ)/R)}; where T is the period number; a3 is the first direction detection data; a4 the second direction detection data; R2 is the second rotation radius; θ is a first predetermined angle.
7. The rotary imaging system of a rotary device according to
respectively acquiring the acceleration detection data of an up zero-crossing point and a down zero-crossing point; wherein the up zero-crossing point is a position with a highest relative horizontal plane of rotation of the third accelerometer, and the down zero-crossing point is a position with a lowest relative horizontal plane of rotation of the third accelerometer;
using a third period calculation formula to obtain the period number based on the acceleration detection data of the up zero-crossing point and the down zero-crossing point and the second rotation radius; the third period number calculation formula is:
T=2π/√{square root over (((a3up*COS θ+a4up*SIN θ+a3down*COS θ+a4down*SIN θ)/R2)/2)}; wherein, T is the period number, and a3up is the first direction detection data of the up zero-crossing point; a4up is the second direction detection data of the up zero-crossing point; a3down is the first direction detection data of the down zero-crossing point; a4down is the second direction detecting data of the down zero-crossing point; R2 is the second rotation radius; θ is a first predetermined angle.
8. The rotary imaging system of a rotary device according to
matching from a period database based on the acceleration detection data and the position parameter to obtain the period number; wherein the period database comprises period numbers of a plurality of position parameters under different acceleration values; and
obtaining the rotation speed value based on the period number.
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The present invention relates to the field of rotary imaging, in particular to a rotary imaging system, a rotary imaging method and a rotary device.
A lamp belt is arranged on a high-speed rotating gyro or a rotating aircraft, so that rotary imaging can be carried out through the lamp belt, specifically, the gyro or the aircraft in the rotating process can display patterns or characters, thereby increasing the interest.
In the process of rotary imaging of lamp belt, most of them use a photoelectric encoder or a Hall element to measure the rotating speed of a lamp belt, and these methods need to measure the rotating speed with the help of static reference points. For example, the China patent CN206950652U discloses a fingertip gyro, which uses an upper top cover or a lower top cover to provide a stationary reference point for a rotating lamp belt. Another example is the China patent CN207503607U. This solution can also measure the rotating speed of the lamp belt by taking the drone as a stationary reference point.
However, when the whole lamp belt carrier rotates or is in motion relative to the ground, it will have different characteristics due to the influence of gravity. These methods of measuring the rotating speed by using the static reference point are usually no longer applicable. At the same time, when the whole lamp belt carrier rotates, its rotating speed will change due to the user's operating function requirements or external force, and the rotary imaging of the lamp belt is very high for the real-time control of the rotating speed requirements of the lamp belt, which depends on the accurate measurement of the rotating speed of the lamp belt.
A gyroscope can also be used to measure the rotating speed of the rotating body. However, the maximum range of the existing gyroscope is usually ±2000°/sec, which is only suitable for the rotating body with a low rotating speed. For the object rotating at high speed, it is obviously not ideal to use gyroscope to measure the rotating speed.
Therefore, how to measure the rotating speed of the rotary device equipped with the lamp belt, realize the accurate measurement of the rotating speed of the lamp belt, and carry out the rotary imaging of the lamp belt according to the measured rotating speed has become an urgent technical problem.
In view of the shortcomings of the above-mentioned prior art, it is an object of the present invention to provide a rotary imaging system, a method and a rotary device of a rotary device, which can accurately measure the rotating speed of a lamp belt and perform rotary imaging of the lamp belt according to the measured rotating speed.
In order to achieve the above purpose, the present invention adopts the following technical solution:
In an aspect, the present invention provides a rotary imaging system of a rotary device, including:
Further, the acceleration value of the predetermined position is obtained based on the acceleration detection data, and the rotation speed value of the circuit board is further obtained based on the acceleration value and the position parameter corresponding to the predetermined position, which specifically includes:
Further, the acceleration detection component includes a first accelerometer and a second accelerometer; the first accelerometer and the second accelerometer are symmetrically arranged on the circuit board with an rotation axis of the rotating body as a center;
Further, obtaining the period number of the circuit board based on the acceleration value and the position parameter specifically includes:
Further, obtaining the period number of the circuit board based on the acceleration value and the position parameter specifically includes:
Further, the acceleration detection component includes a third accelerometer; by taking a connecting line between the third accelerometer and a rotation center of the circuit board as an axis, the third accelerometer has a first speed measuring direction deviating from the axis by a first predetermined angle and a second speed measuring direction deviating from the axis by a second predetermined angle; the acceleration detection data includes first direction detection data corresponding to the first speed measuring direction and second direction detection data corresponding to the second speed measuring direction; the position parameter includes a second rotation radius of the third accelerometer; a sum of the first predetermined angle and the second predetermined angle is 90 degrees;
Further, if the rotating surface is not horizontal, the following steps are executed:
Further, the step of acquiring the rotation speed value of the circuit board specifically includes:
In another aspect, the present invention provides a rotary imaging method of a rotary device, including:
In another aspect, the present invention provides a rotary device using the rotary imaging system of a rotary device.
Compared with the prior art, the rotary imaging system, the rotary imaging method and the rotary device provided by the present invention have the following beneficial effects:
By using the rotary imaging system provided by the present invention, the circuit board is set to rotate synchronously with the rotating body, the acceleration value at the position is obtained through the acceleration detection data set at the predetermined position on the circuit board, and then the rotation speed value of the circuit board is obtained through the acceleration value and the position parameters; because the circuit board rotates synchronously with the rotating body, the rotation speed of the circuit board and the rotating body are the same, and then adaptive control can be carried out for the lamp belt module group to realize rotary imaging.
In order to make the object, technical solution and effect of the present invention more clear and definite, the present invention will be further described in detail with reference to the attached drawings and examples. It should be understood that the specific embodiments described here are only used to explain the present invention, and are not used to limit the present invention.
It should be understood by those skilled in the art that both the foregoing general description and the following detailed description are exemplary and illustrative specific embodiments of the present invention and are not intended to limit the present invention.
The terms “including”, “containing” or any other variation thereof herein are intended to cover non-exclusive inclusion, so that a process or method that includes a list of steps includes not only those steps, but also other steps not explicitly listed or inherent to such process or method. Similarly, without more restrictions, one or more devices or subsystems, elements or structures or components beginning with “including . . . one” will not be without more restrictions, excluding the existence of other devices or other subsystems or other elements or other structures or other components. Throughout this specification, the appearances of the phrases “in one embodiment”, “in another embodiment” and similar language may, but not necessarily, all refer to the same embodiment.
In the description of this application, descriptions referring to the terms “one embodiment”, “some embodiments”, “illustrative embodiments”, “examples”, “specific examples” or “some examples” mean that specific features, structures, materials or characteristics described in connection with this embodiment or example are included in at least one embodiment or example of this application. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.
In this application, for convenience, words and expressions indicating orientation or positional relationship such as “middle”, “upper”, “lower”, “front”, “rear”, “vertical”, “horizontal”, “top”, “inner” and “outer” are used to illustrate the positional relationship of constituent elements with reference to the attached drawings, only for convenience. The positional relationship of the constituent elements is appropriately changed according to the direction of the described constituent elements. Therefore, it is not limited to the words and expressions described in the specification, and can be replaced appropriately according to the situation.
Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this present invention belongs.
The rotary imaging of a lamp belt uses POV phenomenon (Persistence of vision phenomenon), and the principle of this phenomenon is common knowledge, which is beyond the scope of this paper. The use of POV phenomenon to display graphics by a lamp belt is mainly influenced by three factors, including the initial position of light beads, the rotation speed of the lamp belt and the lighting program of the lamp belt. Among them, the initial position of the lamp bead is the inherent property of the lamp belt, which is determined when the lamp belt is made, so it is not discussed in this paper. The rotating speed of the lamp belt and the lighting program of the lamp belt are interrelated. On the one hand, the lamp belt can display graphics by manually programming the lighting program, and then the rotating speed of the lamp belt can be measured and controlled by the computer. On the other hand, the corresponding lighting program can be written by calculating the rotating speed of the lamp belt first. Therefore, in order to make the lamp belt display preset graphics, it is an important part to measure the speed of the lamp belt.
In the prior art, as described in the background of the application, the device using the lamp belt scanning imaging usually needs a static reference point to help measure the rotating speed of the lamp belt, but when the carrier does not have a static reference point, this method of measuring the rotating speed is no longer effective, which greatly limits the development of the lamp belt scanning imaging technology. At the same time, the speed of the lamp belt can not be accurately obtained, which will also affect the quality of scanning imaging of the lamp belt and reduce the sense of experience.
In order to solve the problems mentioned above and in the background, the application provides a rotary imaging method of a rotary device, which can avoid the disadvantage of the need for a stationary reference point in the existing calculation method, obtain the instantaneous rotating speed of the lamp belt, and improve the scanning imaging quality of the lamp belt.
In the calculation of rotational speed, accelerometer is widely used in more and more fields because of its high accuracy and low cost. By using its characteristics, if the accelerometer is fixed on the rotating carrier, then in the process of rotation, the accelerometer can sense many physical quantities directly related to rotation, such as the centrifugal acceleration of rotation, the change of the component of gravity acceleration on the measuring axis caused by the change of accelerometer orientation, etc., so as long as these physical quantities are extracted from the output signal of the accelerometer, the rotational speed (or speed) of the carrier can be obtained. Therefore, the accelerometer is used as the data acquisition device for speed measurement in this application.
Please refer to
The rotary imaging system is used for assisting in detecting the rotating speed value of the rotary device and further performing imaging control, and specifically includes:
Using the rotary imaging system provided by the present invention, the circuit board is set to rotate synchronously with the rotating body, the acceleration value at the predetermined position on the circuit board is obtained through the acceleration detection data, and then the rotation speed value of the circuit board is obtained through the acceleration value and the position parameter. Because the circuit board rotates synchronously with the rotating body, the rotation speed of the circuit board and the rotating body are the same, and then the rotary imaging can be realized through adaptive control for the lamp belt module group 4. According to the present invention, the acceleration value of the rotary device is calculated based on the detection data of the accelerometer, and the instantaneous rotating speed of the rotary device can be quickly calculated, so that the response speed is extremely high.
Further, driving the lamp belt module group 4 to realize rotary imaging specifically includes:
Further, as a preferred solution, in this embodiment, the acceleration value of the predetermined position is obtained based on the acceleration detection data, and then the rotation speed value of the circuit board is obtained based on the acceleration value and the position parameter corresponding to the predetermined position, specifically including:
It should be noted that the predetermined position and the rotation axis of the circuit board form a measuring axis, which faces the direction of the radius of the predetermined position, and the length of the measuring axis is the rotation radius of the acceleration detection component. The acceleration value is obtained based on the formula a=ω2R, the period number is calculated based on the formula T=2π/ω, and the rotation speed value is calculated based on the formula f=1/T, where a represents the acceleration value of the object, R represents the rotation radius of the object, ω represents the angular velocity of the object, T represents the rotation period of the object, and f represents the rotation speed of the object.
Further, please refer to
The acceleration detection data includes the first detection data obtained by the first accelerometer 311 and the second detection data obtained by the second accelerometer 312. The position parameter includes a first rotation radius of the first accelerometer 311 or the second accelerometer 312.
In this embodiment, two accelerometers are used to form the acceleration detection component, and the spatial position layout of the two accelerometers is cleverly designed. They are symmetrically arranged on the circuit board in the center, and the rotation radii of the two accelerometers are the same, so only the first rotation radius of one accelerometer is used to participate in the calculation.
Specifically, as shown in
Specifically, as shown in
Specifically, as shown in
Further, as a preferred solution, in this embodiment, the period number of the circuit board is obtained based on the acceleration value and the position parameter, specifically including:
In this embodiment, the acquisition process of the rotational speed value specifically includes:
Through the acceleration value, the period number of the rotary device 1 is calculated, including:
T=√{square root over (8π2R1/(a1+a2))}, where T is the period number, and R1 is the first rotation radius of the first accelerometer 311 and the second accelerometer 312 relative to the rotation axis of the circuit board 32.
Further, the rotation speed of the rotary device 1 is calculated through the calculation formulas of the period number and the rotation speed, wherein the calculation formula of the rotation speed is:
f=1/T, where f is the speed value.
The rotational imaging method of the present application can quickly and accurately measure the first detection data and the second detection data through the symmetrically arranged first accelerometer 311 and the second accelerometer 312, and quickly calculate the rotational speed based on the first detection data, so as to obtain the control mode corresponding to the rotational speed and realize the rotational imaging of the lamp belt module group 4. Therefore, the rotary imaging method provided by the present invention can accurately measure the rotating speed of the lamp belt, and perform rotary imaging of the lamp belt according to the measured rotating speed.
Further, as a preferred solution, in this embodiment, the period number of the circuit board is obtained based on the acceleration value and the position parameter, specifically including:
Specifically, the formula acquisition process of compensation calculation includes:
Because the measuring axis of the first accelerometer 311 and the measuring axis of the second accelerometer 312 are arranged centrosymmetrically with respect to the rotation axis, the phases of the first accelerometer 311 and the second accelerometer 312 are different by π radians (180°), so then:
{circle around (3)}a1−a10=ω2(R+ΔR1)+a+g sin a cos(ωt);
a2−a20=ω2(R+ΔR2)−a+g sine a cos(ωt+π) equivalent to
{circle around (4)}a2−a20=ω2(R+ΔR2)−a−g sin a cos(ωt)
add {circle around (3)} and {circle around (4)} to obtain:
a1+a2−(a10+a20)=ω2(2R+ΔR1+ΔR2);
a1+a2−(a10+a20)=ω2(2R+ΔR1+ΔR2);
let a0=a10+a20, ΔR=ΔR1+ΔR2;
then: {circle around (5)}a1+a2−a0=ω2(2R+ΔR),
equivalent to ΔR=(a1+a2−a0)/ω2−2R
Substituting the calculation formula ω=2π/T of the angular velocity into {circle around (5)} formula, then:
a1+a2−a0=(2π/T)2(2R+ΔR);
then the expression for calculating the compensation of the period number is:
T=√{square root over (4π2(2R+ΔR)/(a1+a2−a0))};
It should be noted that since each accelerometer 31 has zero-point deviation, it is also possible to calibrate the accelerometer 31 during use to reduce the numerical error. In addition, there may be position deviation during the placement of the accelerometer 31, so it is necessary to perform calibration compensation before calculating the rotation speed of the rotary device 1.
Further, please refer to
The control module 34 is further configured to determine whether the rotating surface of the circuit board is horizontal based on the first direction detection data and the second direction detection data, and if so, use a second period number calculation formula to obtain a period number based on the first direction detection data, the second direction detection data and the second rotation radius; the second period number calculation formula is:
T=2π/√{square root over ((a3 COS θ+a4 SIN θ)/R2)};
When the first predetermined angle is 45 degrees, the corresponding second period calculation formula is:
T=2π/√{square root over (((a3+a4)/√2)/R2)};
That is, in this embodiment, the rotary device includes:
Further, in some embodiments, the judging operation of detecting whether the circuit board is horizontal specifically includes:
if abs(a3−a4)<(a small number such as: 1) for a long time (for example, for 10 times continually) by software, then determining that the rotating plane is not horizontal, by which whether the rotation plane is horizontal or not can be quickly judged.
Further, please refer to
The rotary device forms an included angle with the horizontal plane, that is, when the included angle α is greater than zero, the detection data of the measuring axes in the first speed measuring direction and the second speed measuring direction of the first accelerometer 311 at the up zero-crossing point are set to be a3up and a4up, respectively; the detection data of the measuring axes in the first speed measuring direction and the second speed measuring direction of the first accelerometer 311 at the down zero-crossing point are set to be a3down and a4down, respectively. Through this definition and the third period number calculation formula, the period number up to this time can be calculated.
The period number is obtained based on the acceleration detection data of the up zero-crossing point and the down zero-crossing point and the second rotation radius by using a third period calculation formula; the third period calculation formula is:
T=2π/√{square root over (((a3up*COS θ+a4up*SIN θ+a3down*COS θ+a4down*SIN θ)/R2)/2)};
When the first predetermined angle is 45 degrees, the corresponding third period number calculation formula is:
T=2π/√{square root over ((((a3up+a4up)/√2+(a3down+a4down)/√2)/R)/2)}.
According to the present invention, the acceleration value caused by rotation is separated through hardware structure filtering, and then the rotation speed value is calculated; in this embodiment, the instantaneous speed can be calculated by reading the acceleration value at a single point, so that the present invention has extremely high response speed, avoids the defect that a reference point needs to be stationary in the existing calculation method, can effectively measure the speed of a suspended object, and has good anti-interference ability; even on a carrier with any turbulence, the rotation speed of the rotating platform to the ground can be accurately measured without interference from the carrier, and the obtained instantaneous speed can be obtained.
Further, in practical application, there are gravity acceleration, centripetal acceleration and other accelerations caused by other external forces in the rotary device 1, such as external forces caused by wind and touching other objects. In the present invention, in order to overcome the defect of inaccurate measurement caused by external force, the position of the accelerometer is further defined, and based on this position definition, the detection method based on up zero-crossing and down zero-crossing is specifically defined, that is, in this application, the influence of external forces is filtered by the specific combination of specific structure definition (the accelerometer has the first speed measuring direction and the second speed measuring direction which are 45 degrees away from the axis) and the corresponding speed measuring method, so that the speed measurement influenced by other external forces is solved, and the speed measuring efficiency is improved and the real-time performance is met.
Further, as a preferred solution, in this embodiment, the steps of obtaining the rotation speed value of the circuit board specifically include:
In some embodiments, before calculating the rotational speed value, it further includes:
It should be noted that, in order to avoid complicated floating-point calculation such as square root, the period number corresponding to the detection data of the measuring axis of each accelerometer 31 can be calculated in advance by the computer, and a data table can be made in advance, and then the rotation speed of the rotary device 1 can be quickly calculated by looking up the table in the actual speed measurement process. In other embodiments, the rotary device 1 can also be equipped with a control module 34 that can perform complex mathematical operations, and in the process of scanning and imaging the lamp belt, the real-time rotational speed value can be obtained through real-time mathematical calculations, so that the lamp belt imaging can be controlled in real time.
Further, the measuring range of the accelerometers in the above embodiments is preferably ±16 g, and the maximum rotational speed that can be measured by the accelerometer in this measuring method provided by the present invention is 36.8. When the rotational speed of the rotary device 1 exceeds this threshold, the reading of the accelerometer will overflow, that is, the finally measured rotational speed deviates from the actual rotational speed of the rotary device 1.
Therefore, in some embodiments of the present application, in order to calculate the faster rotation speed, the spatial position layout of the accelerometer is configured to be closer to the rotation axis, that is, the rotation center of the circuit board 32, so as to obtain a smaller rotation radius and further calculate the faster rotation speed. In some embodiments, it is also possible to rotate the accelerometer by an angle, so that the acceleration value generated when the rotary device 1 rotates is not all reflected in one axial direction of the accelerometer, but an angular decomposed component is reflected in one axial direction of the accelerometer, which will also improve the overflow problem of the accelerometer to some extent. In this application, the firm placement of the accelerometer is also one of the important conditions that the accelerometer will not overflow.
Accordingly, referring to
Correspondingly, the present invention provides a rotary device and a rotary imaging system using the rotary device.
The application also provides a rotary device 1 for implementing the above rotary imaging method, and the rotary device 1 includes:
It should be noted that, as shown in
It should be noted that the circuit board 32 is also provided with an input terminal and an output terminal. The input terminal is used for acquiring the detection data of the measuring axis of the accelerometer 31, and the output terminal is used for outputting the rotational speed data calculated by the control module 34. In addition, the circuit board 32 is also provided with a circuit (not shown in the figure) which can provide data channels for the input terminal and the output terminal, and the memory 33 and the control module 34 therein.
It should be noted that the lamp belt module group 4 rotates by 360 degrees about the axis line, and is divided into a plurality of display intervals according to preset graphic data, and each display interval has corresponding display contents; the light bar displays the corresponding content in the display interval according to the rotating speed of the rotary device 1; according to the contents displayed in multiple display intervals, a complete preset graph is combined. At this time, because the lamp belt obtains the instantaneous rotation speed of the rotary device 1, the scanning imaging quality of the lamp belt can be higher, and the graphics can be displayed more stably and clearly.
As shown in
In this embodiment, the motor drives the bracket 221 to rotate, and then the bracket 221 drives the propeller 211 to rotate, so that the rotary device 1 finally rotates.
It should be noted that, as shown in
It should be noted that, in order to facilitate the introduction of the solution, the rotary device in
It should be noted that, as shown in
In this embodiment, the driving module 22 is electrically connected with the control module group 3 to drive the rotation of the rotating module 21, and the lamp belt module group 4 is electrically connected with the control module group 3 and is in transmission connection with the driving module 22 for displaying a preset graphics when the rotary device 1 rotates.
In order to display the graphics displayed by the lamp belt module group 4 more clearly, in this embodiment, the lamp belt module group 4 is arranged on the protective device 6, and in some embodiments, the lamp belt module group 4 can also be arranged inside the protective device 6 in order to protect the lamp belt module group 4.
It can be understood that those skilled in the art can make equivalent substitutions or changes according to the technical solution of the present invention and its inventive concept, and all these changes or substitutions should belong to the protection scope of the appended claims.
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